WORMS 179 
extend nearly to the end of the worm. On the ventral side of the para- 
podia are whitish tubercles with a dark spot in the middle. These 
papille secrete the long, broad tube in which the worm lives. The worm 
is difficult to capture, for when pursued it retreats quickly into its tube, 
which is so large that it can easily turn around within it. (Plate XLVIII.) 
Diopatra cuprea. Head and anterior part of body, showing part of the branchis; 
side view. 
Genus Arabella 
A. opalina. Body cylindrical, twelve to eighteen inches long, one 
quarter of an inch wide in the middle, and tapers to the ends, which are 
comparatively small; lateral appendages short; color bronze, with bril- 
liant, opal-like iridescence; head small, conical, but blunt and without 
tentacles; four eyes in transverse row at the base of the head ; segments 
well marked ; coils into spirals when outside of its burrow. Found in 
compact sandy mud at low-water mark on the New England coast. 
Genus Lumbriconereis 
L. tenuis. Twelve inches or more long, and slender, like a fine cord ; 
bright red and somewhat iridescent; very fragile. Abundant in sandy 
mud on the northern New England coast, and found from New Jersey 
northward. 
FAMILY GLYCERIDE 
These worms are long and smooth, with numerous segments. 
They taper at both ends. The head is small, conical, sharply 
pointed, and has four ery small tentacles. The proboscis, or 
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